ARCHITECTURAL SCALE TRAINER
Read the scale.
Learn to read architectural drawings with an interactive scale ruler. Practice at your own pace, then test your skills in a ten-question challenge.
Match the drawing’s scale. Drag the drawing to pan. Use Ctrl + mouse wheel, pinch, or the zoom buttons to read small marks. Fit brings both endpoints back into view.
Drag, tap the slider, or use arrow keys. Arrow buttons move one scaled inch. The slider makes finer adjustments.
CHALLENGE COMPLETE
Your bench report
KEEP THIS IN YOUR TOOLBOX
A scale shrinks the drawing.
It doesn’t shrink the building.
At 1/4″ = 1′-0″, a quarter inch on the original drawing represents one foot (12 inches) in the real world. It does not represent one inch. At 1/8″ scale, that same foot takes half as much space on paper.
Read the two sides of zero
Whole feet increase to the right. The extra foot to the left is split into 12 inches, increasing away from zero. Start at A, then slide the ruler so a whole-foot mark meets B and A falls in the divided section. Add the two readings.
Example: B at 6 feet and A at 8 inches gives 6′ 8″. The 12-inch mark is a full extra foot, not 0 inches.
Further reading: Using Engineer and Architect Scales (external FEMA PDF). Optional reference from the US Fire Administration.
Practice here. Verify in the field. These original, fictional examples are digital simulations. Screen inches are not calibrated. Use written dimensions and verified scale information on actual drawings. Don’t measure uncalibrated PDFs or screen pixels for construction.